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b in (-oo:+oo)
4-(6*b) = 7*b-113 // - 7*b-113
4-(6*b)-(7*b)+113 = 0
4-6*b-7*b+113 = 0
117-13*b = 0 // - 117
-13*b = -117 // : -13
b = -117/(-13)
b = 9
b = 9
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